Acid-containing package



June 18, 1935. 4 IH, ADLER Er AL 2,004,926

` ACID GONTAINING PACKAGE Filed Oct. l2, 1953 L@ .QW 5M 7%.

Patented June 18, 1935 y' UNITED STATES lPATENT OFFICE ACID CONTAINING PACKAGE Howard Adler and Willard H. Woodstock, Chicago Heights, Ill., assgnors to Victor Chemical Works, Chicago Heights, Ill., a corporation of Illinois Application October 12, 1933, Serial No. 693,346

7 Claims.

This invention relates to an acid-containing package.

Thev use of orthophosphoric acid of strengths of the order of and above has hitherto been 5 extremely slight due primarily to the difliculty of ob-taining suitable containers for the acid. Orthophosphoric acid of such strength solidifies at normally cool fall and Winter temperatures. In order to be pumped from tanks it is necessary to warm the acid to temperatures of the order of 50 to 75 C. At these temperatures thev acid is extremely destructive to the normal rubber lined tanks.

It has now been discovered that if the acid is concentrated to a strength of 89% HaPOi or more, that it may be shipped in ferrous metal containers such as iron or steel. At such concentrations the acid is not destructive to the tanks at temperatures as high as 75 C. or even higher.

The

ture.

As an example of the The following table shows corrosion data upon ordinary steel shipping containers at temperatures of 25 and 75 C.:

Inches penetration per ear. Strength of y H3PO4 Percent Orthophosphoric acid having an H3PO4 content from 89 to 100% may be produced substantially free from pyro and metaphosphoric acids by treating P205 containing gases such as those obtained from phosphorus volatilization processes with an excess of water and condensing at temperatures of the order of to 195 C. and then cooling in acid-proof brick-lined tanks to approximately 75 to 100 C. acid temperature.

The acid is then pumped into steel or iron containers and allowed to cool to normal atmospheric temperatures. Under these conditions the acid is very viscous or solid and exerts a minimum corrosive action on the steel. The containers may be handled or shipped without danger of leaks or substantial contamination of the acid with iron; The acid may be warmed up to the temperatures `necessary to pump it by means of steam coils Within the equipment. The more concentrated acids may be prepared by the addition of. P205 to water in measured amount. The invention is illustrated in the drawing which indicates a diagrammatic broken vertical section of a steel container A, containing the heating coils B and opening C. The package may be of any desired size or form, and the container may be usedfor other purposes if desired. The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible, in View of the prior art. f

What we claim as new, and desire to secure by Letters Patent, is: y

1. A package comprising a common iron or steel container and concentrated orthophosphoric acid 'having an H3PO4 content of 89 to 10,0%, Within said container.

. 2. A package as set forth in claim 1, in which said acid is substantially free from meta and pyrophosphoric acid.

3. A package as set forth in claim l, in which the I-IsPOi content is 89-97%.

4. A package as set forth in claim 1, in which said container is steel.

5. A package as set forth in claim 1, in which means are provided within saidI container adapted to circulate a heating fiuid, whereby the viscosity of said acid may be reduced and removal thereof facilitated.

6. The method of packagingk orthophosphoric acid in common iron or steel containers which comprises concentrating the acid to at least 89% H3PO4, and storing said acid in a common iron or steel container. y

7. The method of packaging orthophosphoric acid in common iron or steel containers which comprises concentrating the acid to at least 89% H3PO4, freeing the acid from substantial quantities of pyro or meta-phosphoric acid, and storing the acid in a steel container.

HOWARD ADLER. WILLARD H. WOODSTOCK. 

